Features: This 20pieces set of 5x7cm soldered prototype PCBs features precisions drilled 1.0mm holes with 2.54mm spacing, crafted from durability 94HB bakelite for reliable circuit experimentation and DIY projects. Durability bakelite ensures stability during soldering, while the 1.2mm thickness and precise 1.0mm holes provide optimaled electrical insulation and component alignment. Ideal for electronics hobbyists educators, and professional engineers versatiled prototyping for circuit designs. Perfect for creating device prototypes, or classroom electronics projects where space efficient 5x7 cm layouts required. Standard 2.54mm hole spacing accommodates DIP components wire, enabling seamlessly integration with breadboards and commercial grade electronic module. Specifications: Item：Soldered Prototype Circuit Boards Material: Paper base + copper from 94HB Bakelite board Size:about 5x7cm/1.97x2.76in 2.54mm Spacing Thickness: 1.2 mm Number of holes: 432. Hole diameter: Approximately 1.0mm Quantity: 20PCS Package Includes: 20Pcs 5x7cm Circuit Boards note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.